How do you know if you carry a recessive blue-eyed gene?

Question

How do you know if you carry a recessive blue-eyed gene?

Answer 1

Eye color is not the result of a single gene.  There are primarily two genes involved . . . B & G.  If you are dominant at B then you have brown eyes and it doesn't matter what alleles you have at the G gene.  If you are homozygous recessive at the B gene (bb), then it matters what you have at the G gene.  If you're bb and then dominant at G, then you have green.  So, the only way to actually have blue eyes is to be bbgg.

If you have brown or green eyes and have a kid with blue eyes, then you had to have carried a b and g allele.  If one of your parents has blue eyes, then you know that you also carry a b and g allele.  But, even if neither of your parents has blue eyes, you still could carry the alleles.

Answer 2

What color are your parents eyes?  Your grandparents on both sides?

Answer 3

There isn't any really easy way to know.  Unless one of your parents has blue eyes.  Very simply, blue eye color requires two genes which are recessive.  There are additional considerations, but basically, if one parent has blue eyes, you will have one gene for blue eyes from that parent.  If you got a dominant gene from the other parent, your eyes will be that color.

Answer 4

Sophia J is right but , I learned it this way when it comes to color in genetics. This is the simplified version. The recessive gene is always there. What this means is that if a recessive color "manifest" you know it to be there. All of its descendants after then carry that gene visible or not it is there. So in answer to your question- If  you know of any of your direct descendants having had  blue eyes whether your great, great, great grand mother or grand father or any one in between than you carry that gene. The recessive can lay dormant for generations. They will resurface when teamed up with another recessive of the same (if your mate carries the gene.) In dominate traits if you can't see it it's not there. Example if you have blue eyes, your parents have brown eyes and your husband has blue eyes all your children will have blue eyes. In dominates it must be visible to be passed on. What you don't see isn't there. Now comes the more confusing part that Sophia is expressing and that is blends if you know of green eyes or combination colors or a direct descendant having one eye color of this and the other color of that get back to me and  I'll go into more detail but I don't see it necessary here.

Answer 5

well if you have brown eyes then u didnt carry that gene

Answer 6

I think the only way to know is to look at the offspring, but I don't think this information helps!  I don't know if there are any genetic testing that one could undergo, but I'm sure that it would be costly.

Answer 7

You don't its random.

Answer 8

The only sure way is if you have a child that has blue eyes!  However, you could build a pedigree chart for as many generations as possible.  If any one of your ancestors had blue eyes, then there would be a possibility of carrying a blue-eye gene masked by dominant gene for dark eye colors.

Answer 9

you would have to look at your family to figure that out.